Resumen

ROSADO-PUCCINI, Rafael; LANDINES-PARRA, Miguel Á.  y  VALBUENA-VILLARREAL, Rubén D.. Comparison of the fatty acids profiles in eggs of rainbow trout Oncorhynchus mykiss) and red tilapia (Oreochromis sp.). Orinoquia [online]. 2014, vol.18, suppl.1, pp.260-268. ISSN 0121-3709.

Fatty acids profiles are an indirect indicator of egg quality in fish; their determination is a valid approximation in the production schemes of fish seeds. In this composition interact several determinant variables, such as environmental conditions and plants management; its evaluation is convenient as part of the routine check in specialized farms. The purpose of this work was to evaluate and analyze the differences in composition of fatty acids between the recently fertilized eggs of rainbow trout and red tilapia. Recently fertilized eggs of both species were obtained from exploitation sites located in Guasca (Cundinamarca) and Aipe (Huila). The determination of fatty acids was done with a gas chromatograph. The profiles included 17 fatty acids and the contents were compared by means analysis (α=0.05), previously there was a verification of the requisite of normality. The general distribution pattern as well as the dispersion of data shown was similar in both species. Except in C16:1n-7, C18:2n-6 and C20:1n-9, the others showed significant differences. The defined ranges for each species correspond to what have been reported by similar studies, which suggests that the processed dry food used provides the minimum necessary requirements for the diets of parent animals. That reaffirms the conservative condition of acids mobilization during the vitelogenesis. It was concluded that the differences found are a logical manifestation of variable environmental systems and nutritional management.  Higher homogeneity was observed in the trouts because they are fed exclusively with dry processed food, unlike tilapias, which are fed with additional resources from their environment. The relation of the differences and the temperature used are discussed.

Palabras clave : fish seed quality; egg composition; reproduction..

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